Set up Real User Monitoring (RUM) support

The JavaScript RUM Agent offers real user monitoring (RUM) support.

Example config with RUM enabled:

apm-server.rum.enabled: true
apm-server.rum.event_rate.limit: 300
apm-server.rum.event_rate.lru_size: 1000
apm-server.rum.allow_origins: ['*']
apm-server.rum.library_pattern: "node_modules|bower_components|~"
apm-server.rum.exclude_from_grouping: "^/webpack"
apm-server.rum.source_mapping.cache.expiration: 5m
apm-server.rum.source_mapping.index_pattern: "apm-*-sourcemap*"

To enable RUM support, set apm-server.rum.enabled to true. By default this is disabled.

Defines the maximum amount of events allowed to be sent to the APM Server RUM endpoint per ip per second. Defaults to 300.

An LRU cache is used to keep a rate limit per IP for the most recently seen IPs. This setting defines the number of unique IPs that can be tracked in the cache. Sites with many concurrent clients should consider increasing this limit. Defaults to 1000.

Comma separated list of permitted origins for RUM support. User-agents send an Origin header that will be validated against this list. This is done automatically by modern browsers as part of the CORS specification. An origin is made of a protocol scheme, host and port, without the URL path. Default value is set to ['*'], which allows everything.

RegExp to be matched against a stacktrace frame’s file_name and abs_path attributes. If the RegExp matches, the stacktrace frame is considered to be a library frame. When source mapping is applied, the error.culprit is set to reflect the function and the filename of the first non library frame. This aims to provide an entry point for identifying issues. Default value is "node_modules|bower_components|~".

RegExp to be matched against a stacktrace frame’s file_name. If the RegExp matches, the stacktrace frame is excluded from being used for calculating error groups. The default pattern excludes stacktrace frames that have a filename starting with /webpack.

Configure the Elasticsearch source map retrieval location, taking the same options as output.elasticsearch. This must be set when using an output other than Elasticsearch, and that output is writing to Elasticsearch. Otherwise leave this section empty.

If a source map has been uploaded to the APM Server, source mapping is automatically applied to documents sent to the RUM endpoint. Source maps are fetched from Elasticsearch and then kept in an in-memory cache for the configured time. Values configured without a time unit are treated as seconds. Default value is 5 minutes.

Source maps are stored in a separate index apm-%{[observer.version]}-sourcemap by default. If changed, a matching index pattern needs to be specified here.